EN IEC 61869-1:2024

Instrument transformers - Part 1: General requirements

IEC 61869-1:2023 is applicable to newly manufactured instrument transformers intended for applications where the nominal voltage is higher than 1 kV AC or 1,5 kV DC, with an analogue or a digital secondary signal for measuring, protection and control purposes, with rated frequencies from 15 Hz to 400 Hz, or for DC applications. The general requirements for instrument transformers for applications in LV systems (nominal voltage ≤ 1 kV AC or ≤ 1,5 kV DC) are covered by IEC 61869-201. This part of IEC 61869 is a product family standard and covers general requirements only. For each type of instrument transformer, the product standard is composed of this document and the relevant specific product standard. This part of IEC 61869 contains the requirements for the limits of the errors both for analogue and digital secondary signal. The other characteristics of a digital interface for instrument transformer are standardised in IEC 61869-9 as an application of the IEC 61850 horizontal standard series, covering communication networks and systems for power utility automation. This part of IEC 61869 considers bandwidth requirements. The accuracy requirements on harmonics and requirements for the anti-aliasing filter are specified in 5.7. IEC 61869-1:2023 cancels and replaces the first edition published in 2007 and IEC 61869 6:2016. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) merger with IEC 61869-6:2016; b) new scope: equipment for HV applications with a nominal voltage > 1 kV AC or 1,5 kV DC; c) new classification of some special tests as type tests or routine test; d) additional type tests, additional special tests and new clause for commissioning tests; e) new annexes E, F, G and I.

Messwandler - Teil 1: Allgemeine Anforderungen

Transformateurs de mesure - Partie 1: Exigences générales

L'IEC 61869-1:2023 s’applique aux transformateurs de mesure récemment fabriqués destinés à des applications dont la tension nominale est supérieure à 1 kV en courant alternatif ou à 1,5 kV en courant continu, qui utilisent un signal secondaire analogique ou numérique à des fins de mesure, de protection et de commande, avec des fréquences assignées comprises entre 15 Hz et 400 Hz, ou à des applications en courant continu. Les exigences générales concernant les transformateurs de mesure destinés à des applications dans les réseaux BT (tension nominale ≤ 1 kV en courant alternatif ou ≤ 1,5 kV en courant continu) sont couvertes par l’IEC 61869-201. La présente partie de l’IEC 61869 est une norme de famille de produits et couvre uniquement les exigences générales. Pour chaque type de transformateur de mesure, la norme de produit se compose du présent document et de la norme de produit spécifique appropriée. La présente partie de l’IEC 61869 contient les exigences relatives aux limites d’erreurs, tant pour le signal secondaire analogique que pour le signal secondaire numérique. Les autres caractéristiques d’une interface numérique d’un transformateur de mesure sont normalisées dans l’IEC 61869-9 en tant qu’application de la série de normes horizontales IEC 61850, couvrant les réseaux et les systèmes de communication pour l’automatisation des systèmes électriques. La présente partie de l’IEC 61869 traite des exigences relatives à la largeur de bande. Les exigences de précision concernant les harmoniques et les exigences relatives au filtre antirepliement sont spécifiées en 5.7. L'IEC 61869-1:2023 annule et remplace la première édition publiée en 2007 et l’IEC 61869‑6:2016. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l’édition précédente: a) fusion avec l’IEC 61869-6:2016; b) nouveau domaine d’application: matériel pour les applications HT avec une tension nominale > 1 kV en courant alternatif ou 1,5 kV en courant continu; c) nouvelle classification de certains essais spéciaux en essais de type ou en essais individuels de série; d) essais de type supplémentaires, essais spéciaux supplémentaires et nouvel article pour les essais de mise en service; e) nouvelles Annexes E, F, G et I.

Instrumentni transformatorji - 1. del: Splošne zahteve (IEC 61869-1:2023)

Standard IEC 61869-1:2023 se uporablja za novo izdelane instrumentne transformatorje, namenjene za uporabo, kadar je nazivna napetost višja od 1 kV pri izmeničnem toku oziroma 1,5 kV pri enosmernem toku, z analognim ali digitalnim sekundarnim signalom za merjenje, zaščito in krmiljenje ter nazivno frekvenco od 15 Hz do 400 Hz, ali za uporabo z enosmernim tokom.
Splošne zahteve za uporabo instrumentnih transformatorjev v nizkonapetostnem omrežju (nazivna napetost ≤ 1 kV pri izmeničnem toku ali ≤ 1,5 kV pri enosmernem toku) so zajete v standardu IEC 61869-201.
Ta del standarda IEC 61869 je standard družine izdelkov in zajema samo splošne zahteve. Standard za posamezno vrsto instrumentnega transformatorja je sestavljen iz tega dokumenta in ustreznega standarda za izdelek.
Ta del standarda IEC 61869 vsebuje zahteve glede omejitev napak za analogni in digitalni sekundarni signal. Druge lastnosti digitalnega vmesnika za instrumentne transformatorje so standardizirane v standardu IEC 61869-9 kot uporaba vzporedne skupine standardov IEC 61850, ki zajemajo komunikacijska omrežja in sisteme za avtomatizacijo porabe električne energije.
Ta del standarda IEC 61869 obravnava zahteve glede pasovne širine. Zahteve glede natančnosti pri harmonskih nihanjih in zahteve za filtre za odpravljanje potujevanja frekvenc so določene v točki 5.7.
Standard IEC 61869-1:2023 razveljavlja in nadomešča prvo izdajo, objavljeno leta 2007, in standard IEC 61869 6:2016. Ta izdaja je tehnično popravljena izdaja.
Ta izdaja v primerjavi s prejšnjo vključuje naslednje pomembne tehnične spremembe:
a) združitev s standardom IEC 61869-6:2016;
b) novo področje uporabe: oprema za uporabo v visokonapetostnem omrežju z nazivno napetostjo > 1 kV pri izmeničnem toku oziroma 1,5 kV pri enosmernem toku;
c) nova razvrstitev nekaterih posebnih preskusov kot tipskih ali rutinskih preskusov;
d) dodatni tipski preskusi, dodatni posebni preskusi in nova točka za zagonske preskuse;
e) novi dodatki E, F, G in I.

General Information

• Status: Published
• Publication Date: 24-Oct-2024
• ICS: 17.220.20 - Measurement of electrical and magnetic quantities
• Technical Committee: CLC/TC 38 - Instrument transformers
• Drafting Committee: IEC/TC 38 - IEC_TC_38
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 25-Oct-2024
• Completion Date: 25-Oct-2024
• Directive: 2014/30/EU - Directive 2014/30/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to electromagnetic compatibility (recast)
• Directive: 2014/35/EU - Directive 2014/35/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of electrical equipment designed for use within certain voltage limits
• Directive: 2014/53/EU - Directive 2014/53/EU of The European Parliament and of the Council of 16 April 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of radio equipment and repealing Directive 1999/5/EC
• Mandate: M/511 - Mandate to CEN, CENELEC and ETSI relating to harmonised standards in the field of the Low Voltage Directive
• Mandate: M/552 - [C(2016) 7641 final] Standardisation request as regards harmonised standards in support of Directive 2014/30/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to electromagnetic compatibility
• Ref Project: SIST EN IEC 61869-1:2024 - Instrument transformers - Part 1: General requirements (IEC 61869-1:2023)

Relations

• Replaces: EN 61869-6:2016 - Instrument transformers - Part 6: Additional general requirements for low-power instrument transformers
• Effective Date: 07-Nov-2023
• Replaces: EN 61869-1:2009 - Instrument transformers - Part 1: General requirements
• Effective Date: 26-Jan-2023

Overview

EN IEC 61869-1:2024 (adopted from IEC 61869-1:2023) is the product-family standard that defines the general requirements for instrument transformers intended for high-voltage applications (nominal voltage > 1 kV AC or > 1.5 kV DC). It covers newly manufactured instrument transformers that provide analogue or digital secondary signals for measuring, protection and control at rated frequencies from 15 Hz to 400 Hz and for DC applications. This part establishes core principles and limits of error; each specific transformer type must be used together with its relevant product-specific standard.

Key topics and technical requirements

• Scope and applicability: Intended for HV instrument transformers; LV systems (≤ 1 kV AC or ≤ 1.5 kV DC) are covered by IEC 61869-201.
• Accuracy and error limits: Requirements for limits of errors are specified for both analogue and digital secondary signals.
• Digital interfaces and bandwidth: Considers bandwidth requirements for digital outputs; digital interface characteristics are standardized in IEC 61869-9 (an application of the IEC 61850 series).
• Harmonic and anti-aliasing requirements: Accuracy on harmonics and anti-aliasing filter requirements are specified (see clause 5.7).
• Environmental and mechanical conditions: Defines normal and special environmental conditions (temperature, altitude, vibration, pollution, indoor/outdoor use).
• Testing and conformity: New edition reorganizes and clarifies type tests, routine tests, special tests and introduces commissioning tests. Additional type and special tests are included.
• Standards consolidation: This edition merges IEC 61869-6:2016 into Part 1 and updates technical requirements (new annexes E, F, G and I).

Applications

• Substation measurement and protection systems for transmission and distribution networks
• Metering and revenue-grade measurement at HV levels
• Protection relays and control systems requiring accurate analogue or digital instrument signals
• Factory acceptance testing, type testing and commissioning of HV transformers and switchgear

Who should use this standard

• Manufacturers of current and voltage instrument transformers (HV)
• Utility engineers specifying transformers for protection, metering and control
• Testing laboratories and certification bodies performing type and routine tests
• System integrators and protection & control engineers implementing IEC 61850/IEC 61869-9 digital interfaces
• Procurement and compliance teams ensuring equipment meets European (EN) and international (IEC) requirements

Related standards

• IEC 61869-9 - Digital interface for instrument transformers
• IEC 61869-201 - Instrument transformers for LV systems
• IEC 61850 series - Communication networks and systems for power utility automation
• Referenced IEC/EN standards for testing, EMC and insulation (for example IEC 60060-1, IEC 61000 series)

By aligning equipment design, testing and procurement with EN IEC 61869-1:2024, stakeholders ensure consistent accuracy, interoperability and safe deployment of instrument transformers in high-voltage power systems.

Standards Content (Sample)

SLOVENSKI STANDARD
01-december-2024
Instrumentni transformatorji - 1. del: Splošne zahteve (IEC 61869-1:2023)
Instrument transformers - Part 1: General requirements (IEC 61869-1:2023)
Messwandler - Teil 1: Allgemeine Anforderungen (IEC 61869-1:2023)
Transformateurs de mesure - Partie 1: Exigences générales (IEC 61869-1:2023)
Ta slovenski standard je istoveten z: EN IEC 61869-1:2024
ICS:
17.220.20 Merjenje električnih in Measurement of electrical
magnetnih veličin and magnetic quantities
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 61869-1

NORME EUROPÉENNE
EUROPÄISCHE NORM October 2024
ICS 17.220.20 Supersedes EN 61869-1:2009; EN 61869-6:2016
English Version
Instrument transformers - Part 1: General requirements
(IEC 61869-1:2023)
Transformateurs de mesure - Partie 1: Exigences générales Messwandler - Teil 1: Allgemeine Anforderungen
(IEC 61869-1:2023) (IEC 61869-1:2023)
This European Standard was approved by CENELEC on 2024-09-11. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 61869-1:2024 E

European foreword
The text of document 38/718/FDIS, future edition 2 of IEC 61869-1, prepared by TC 38 "Instrument
Transformers" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2025-10-31
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2027-10-31
document have to be withdrawn
This document supersedes EN 61869-1:2009 and EN 61869-6:2016 and all of its amendments and
corrigenda (if any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 61869-1:2023 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standard indicated:
IEC 60255-1:2009 NOTE Approved as EN 60255-1:2010 (not modified)
IEC 60255-27:2013 NOTE Approved as EN 60255-27:2014 (not modified)
IEC 60664-1 NOTE Approved as EN IEC 60664-1
IEC 60695-1-30 NOTE Approved as EN 60695-1-30
IEC 60695-7-1 NOTE Approved as EN 60695-7-1
IEC 60721-2-6 NOTE Approved as EN IEC 60721-2-6
IEC 60812 NOTE Approved as EN IEC 60812
IEC 61000 (series) NOTE Approved as EN IEC 61000 (series)
IEC 61000-4-7 NOTE Approved as EN 61000-4-7
IEC 61000-6-5 NOTE Approved as EN 61000-6-5
IEC 61025 NOTE Approved as EN 61025
IEC 61754-2 NOTE Approved as EN 61754-2
IEC 61754-20 NOTE Approved as EN 61754-20
IEC 62262 NOTE Approved as EN 62262
IEC 62271-1:2017 NOTE Approved as EN 62271-1:2017 (not modified)
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod), the
relevant EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cencenelec.eu.
Publication Year Title EN/HD Year
IEC 60060-1 - High-voltage test techniques - Part 1: EN 60060-1 -
General definitions and test requirements
IEC 60068-2-1 - Environmental testing - Part 2-1: Tests - EN 60068-2-1 -
Test A: Cold
IEC 60068-2-2 2007 Environmental testing - Part 2-2: Tests - EN 60068-2-2 2007
Test B: Dry heat
IEC 60068-2-6 - Environmental testing - Part 2-6: Tests - EN 60068-2-6 -
Test Fc: Vibration (sinusoidal)
IEC 60068-2-11 - Environmental testing - Part 2-11: Tests - EN IEC 60068-2-11 -
Test Ka: Salt mist
IEC 60068-2-17 - Environmental testing - Part 2-17: Tests - EN IEC 60068-2-17 -
Test Q: Sealing
IEC 60068-2-27 2008 Environmental testing - Part 2-27: Tests - EN 60068-2-27 2009
Test Ea and guidance: Shock
IEC 60068-2-47 - Environmental testing - Part 2-47: Test - EN 60068-2-47 -
Mounting of specimens for vibration,
impact and similar dynamic tests
IEC 60068-2-57 2013 Environmental testing - Part 2-57: Tests - EN 60068-2-57 2013
Test Ff: Vibration - Time-history and sine-
beat method
IEC 60068-2-75 - Environmental testing - Part 2-75: Tests - EN 60068-2-75 -
Test Eh: Hammer tests
IEC 60068-2-78 2012 Environmental testing - Part 2-78: Tests - EN 60068-2-78 2013
Test Cab: Damp heat, steady state
IEC 60068-3-3 2019 Environmental testing - Part 3-3: EN IEC 60068-3-3 2019
Supporting documentation and guidance -
Seismic test methods for equipment
IEC 60071-1 2019 Insulation co-ordination - Part 1: EN IEC 60071-1 2019
Definitions, principles and rules
IEC 60071-2 2018 Insulation co-ordination - Part 2: EN IEC 60071-2 2018
Application guidelines
IEC 60085 - Electrical insulation - Thermal evaluation EN 60085 -
and designation
IEC 60270 2000 High-voltage test techniques - Partial EN 60270 2001
discharge measurements
+ A1 2015  + A1 2016
IEC 60296 - Fluids for electrotechnical applications - EN IEC 60296 -
Mineral insulating oils for electrical
equipment
IEC 60376 - Specification of technical grade sulphur EN IEC 60376 -
hexafluoride (SF ) and complementary
gases to be used in its mixtures for use in
electrical equipment
IEC 60455 series Resin based reactive compounds used for EN IEC 60455 series
electrical insulation
IEC 60475 - Method of sampling insulating liquids EN IEC 60475 -
IEC 60480 - Specification for the re-use of sulphur EN IEC 60480
hexafluoride (SF6) and its mixtures in
electrical equipment
IEC 60529 1989 Degrees of protection provided by EN 60529 1991
enclosures (IP Code)
- -  + corrigendum May 1993
+ A1 1999  + A1 2000
+ A2 2013  + A2 2013
IEC 60603-7-1 - Connectors for electronic equipment - Part EN 60603-7-1 -
7-1: Detail specification for 8-way,
shielded, free and fixed connectors
IEC 60695-1-10 - Fire hazard testing - Part 1-10: Guidance EN 60695-1-10 -
for assessing the fire hazard of
electrotechnical products - General
guidelines
IEC 60695-1-11 - Fire hazard testing - Part 1-11: Guidance EN 60695-1-11 -
for assessing the fire hazard of
electrotechnical products - Fire hazard
assessment
IEC 60794-2 2017 Optical fibre cables - Part 2: Indoor cables EN 60794-2 2017
- Sectional specification
IEC 60794-3 - Optical fibre cables - Part 3: Outdoor EN IEC 60794-3 -
cables - Sectional specification
IEC/TS 60815-1 2008 Selection and dimensioning of high-voltage - -
insulators intended for use in polluted
conditions - Part 1: Definitions, information
and general principles
IEC/TS 60815-2 2008 Selection and dimensioning of high-voltage - -
insulators intended for use in polluted
conditions - Part 2: Ceramic and glass
insulators for a.c. systems
IEC/TS 60815-3 2008 Selection and dimensioning of high-voltage - -
insulators intended for use in polluted
conditions - Part 3: Polymer insulators for
a.c. systems
IEC 60867 - Insulating liquids - Specifications for EN IEC 60867 -
unused liquids based on synthetic aromatic
hydrocarbons
IEC/TR 61000-4-1 - Electromagnetic compatibility (EMC) - Part
4-1: Testing and measurement techniques
- Overview of IEC 61000-4 series
IEC 61000-4-2 - Electromagnetic compatibility (EMC) - Part EN 61000-4-2 -
4-2: Testing and measurement techniques
- Electrostatic discharge immunity test
IEC 61000-4-3 - Electromagnetic compatibility (EMC) - Part EN IEC 61000-4-3 -
4-3: Testing and measurement techniques
- Radiated, radio-frequency,
electromagnetic field immunity test
IEC 61000-4-4 - Electromagnetic compatibility (EMC) - Part EN 61000-4-4 -
4-4: Testing and measurement techniques
- Electrical fast transient/burst immunity
test
IEC 61000-4-5 2014 Electromagnetic compatibility (EMC) - Part EN 61000-4-5 2014
4-5: Testing and measurement techniques
- Surge immunity test
+ A1  + A1 2017
IEC 61000-4-6 - Electromagnetic compatibility (EMC) - Part EN 61000-4-6 -
4-6: Testing and measurement techniques
- Immunity to conducted disturbances,
induced by radio-frequency fields
IEC 61000-4-8 - Electromagnetic compatibility (EMC) - Part EN 61000-4-8 -
4-8: Testing and measurement techniques
- Power frequency magnetic field immunity
test
IEC 61000-4-9 - Electromagnetic compatibility (EMC) - Part EN 61000-4-9 -
4-9: Testing and measurement techniques
- Impulse magnetic field immunity test
IEC 61000-4-10 - Electromagnetic compatibility (EMC) - Part EN 61000-4-10 -
4-10: Testing and measurement
techniques - Damped oscillatory magnetic
field immunity test
IEC 61000-4-11 - Electromagnetic compatibility (EMC) - Part EN IEC 61000-4-11 -
4-11: Testing and measurement
techniques - Voltage dips, short
interruptions and voltage variations
immunity tests for equipment with input
current up to 16 A per phase
IEC 61000-4-13 - Electromagnetic compatibility (EMC) - Part EN 61000-4-13 -
4-13: Testing and measurement
techniques - Harmonics and
interharmonics including mains signalling
at a.c. power port, low frequency immunity
tests
IEC 61000-4-16 - Electromagnetic compatibility (EMC) - Part EN 61000-4-16 -
4-16: Testing and measurement
techniques - Test for immunity to
conducted, common mode disturbances in
the frequency range 0 Hz to 150 kHz
IEC 61000-4-17 - Electromagnetic compatibility (EMC) - Part EN 61000-4-17 -
4-17: Testing and measurement
techniques - Ripple on d.c. input power
port immunity test
IEC 61000-4-18 2019 Electromagnetic compatibility (EMC) - Part EN IEC 61000-4-18 2019
4-18: Testing and measurement
techniques - Damped oscillatory wave
immunity test
IEC 61000-4-29 - Electromagnetic compatibility (EMC) - Part EN 61000-4-29 -
4-29: Testing and measurement
techniques - Voltage dips, short
interruptions and voltage variations on d.c.
input power port immunity tests
IEC 61000-6-4 2018 Electromagnetic compatibility (EMC) - Part EN IEC 61000-6-4 2019
6-4: Generic standards - Emission
standard for industrial environments
IEC 61076-2-101 - Connectors for electronic equipment - EN 61076-2-101 -
Product requirements - Part 2-101: Circular
connectors - Detail specification for M12
connectors with screw-locking
IEC 61083-1 - Instruments and software used for EN 61083-1 -
measurements in high-voltage and high-
current tests - Part 1: Requirements for
instruments for impulse tests
IEC 61099 - Insulating liquids - Specifications for EN 61099 -
unused synthetic organic esters for
electrical purposes
IEC 61181 - Mineral oil-filled electrical equipment - EN 61181 -
Application of dissolved gas analysis
(DGA) to factory tests on electrical
equipment
IEC 61462 - Composite hollow insulators - Pressurized EN IEC 61462 -
and unpressurized insulators for use in
electrical equipment with AC rated voltage
greater than 1 000 V AC and D.C. voltage
greater than 1500V - Definitions, test
methods, acceptance criteria and design
recommendations
IEC 61850-7-4 - Communication networks and systems for EN 61850-7-4 -
power utility automation - Part 7-4: Basic
communication structure - Compatible
logical node classes and data object
classes
IEC 61869-9 2016 Instrument transformers - Part 9: Digital EN IEC 61869-9 2019
interface for instrument transformers
IEC 61869-99 - Instrument transformers - Part 99: EN IEC 61869-99 -
Glossary
IEC 62155 - Hollow pressurized and unpressurized EN 62155 -
ceramic and glass insulators for use in
electrical equipment with rated voltages
greater than 1 000 V
IEC 62217 2012 Polymeric HV insulators for indoor and EN 62217 2013
outdoor use - General definitions, test
methods and acceptance criteria
IEC 62271-4 2022 High-voltage switchgear and controlgear - EN IEC 62271-4 2022
Part 4: Handling procedures for gases for
insulation and/or switching
IEC 62271-100 - High-voltage switchgear and controlgear - EN IEC 62271-100 -
Part 100: Alternating-current circuit-
breakers
IEC 62271-203 2022 High-voltage switchgear and controlgear - EN IEC 62271-203 2022
Part 203: AC gas-insulated metal-enclosed
switchgear for rated voltages above 52 kV
IEC 62770 - Fluids for electrotechnical application – EN IEC 62772 -
Unused natural esters for transformers and
similar electrical equipment
IEC 63012 - Insulating liquids - Unused modified or EN IEC 63012 -
blended esters for electrotechnical
applications
ISO 4628-3 - Paints and varnishes - Evaluation of EN ISO 4628-3 -
degradation of coatings - Designation of
quantity and size of defects, and of
intensity of uniform changes in appearance
- Part 3: Assessment of degree of rusting
ISO 22479 - Corrosion of metals and alloys - Sulfur EN ISO 22479 -
dioxide test in a humid atmosphere (fixed
gas method)
CISPR/TR 18-2 - Radio interference characteristics of - -
overhead power lines and high-voltage
equipment - Part 2: Methods of
measurement and procedure for
determining limits
ISO/IEC/IEEE - Information technology - Smart transducer - -
21451-4 interface for sensors and actuators - Part
4: Mixed-mode communication protocols
and Transducer Electronic Data Sheet
(TEDS) formats
IEC 61869-1 ®
Edition 2.0 2023-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Instrument transformers –
Part 1: General requirements
Transformateurs de mesure –
Partie 1: Exigences générales
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.220.20  ISBN 978-2-8322-6940-4

– 2 – IEC 61869-1:2023 © IEC 2023
CONTENTS
FOREWORD . 9
INTRODUCTION . 12
1 Scope . 14
2 Normative references . 15
3 Terms, definitions, symbols and abbreviated terms . 18
3.1 Terms and definitions . 18
3.2 Symbols and abbreviated terms . 18
4 Normal and special environmental conditions . 19
4.1 General . 19
4.2 Normal environmental conditions . 20
4.2.1 Ambient air temperature . 20
4.2.2 Altitude . 20
4.2.3 Vibrations or earth tremors . 20
4.2.4 Exposure to pollution . 20
4.2.5 Other environmental conditions for indoor instrument transformers . 20
4.2.6 Other environmental conditions for outdoor instrument transformers . 21
4.2.7 IT with outdoor parts . 21
4.3 Special environmental conditions . 21
4.3.1 General . 21
4.3.2 Altitude . 21
4.3.3 Ambient temperature . 21
4.3.4 Vibrations or earth tremors . 22
4.3.5 Earthquakes . 22
5 Ratings . 22
5.1 General . 22
5.2 Voltage ratings . 22
5.2.1 Highest voltage for equipment (U ) . 22
m
5.2.2 Power system earthing . 25
5.2.3 Standard values for rated primary voltage (U ) . 25
pr
5.2.4 Standard values for rated secondary voltage (U ) . 25
sr
5.2.5 Rated auxiliary power supply voltage (U ) . 25
ar
5.3 Current ratings . 26
5.3.1 Standard values for rated primary current (I ) . 26
pr
5.3.2 Standard values for rated secondary current (I ) . 26
sr
5.3.3 Standard values for rated continuous thermal current (I ) . 26
cth
5.3.4 Short-time current ratings . 26
5.4 Dielectric ratings . 27
5.4.1 General . 27
5.4.2 Rated primary terminal insulation level . 27
5.4.3 Other requirements for primary terminal insulation . 27
5.4.4 Between-section insulation requirements . 29
5.4.5 Insulation requirements for secondary terminals and low-voltage
components . 29
5.5 Rated frequency (f ) . 30
r
5.6 Output ratings . 30

IEC 61869-1:2023 © IEC 2023 – 3 –
5.6.1 Rated output for inductive instrument transformers and CVTs . 30
5.6.2 Rated burden for LPITs . 30
5.6.3 Standard values for the rated delay time for EITs (t ) . 30
dr
5.7 Accuracy requirements . 30
5.7.1 General . 30
5.7.2 Rated accuracy classes . 31
5.7.3 Accuracy class extension for harmonics . 31
5.7.4 Accuracy requirements for harmonics . 31
5.7.5 Harmonic requirements for LPIT protection accuracy classes . 34
5.7.6 Anti-aliasing filter for EIT using digital data processing . 34
6 Design and construction . 36
6.1 Requirements for liquids used in equipment . 36
6.1.1 General . 36
6.1.2 Liquid quality . 36
6.1.3 Liquid level indicator . 37
6.1.4 Liquid tightness . 37
6.2 Requirements for gases used in equipment . 37
6.2.1 General . 37
6.2.2 Gas quality . 37
6.2.3 Gas monitoring device . 37
6.2.4 Gas tightness . 37
6.2.5 Pressure-relief device . 38
6.3 Requirements for solid materials used in equipment . 38
6.4 Requirements for temperature rise of parts and components . 38
6.4.1 General . 38
6.4.2 Influence of altitude on temperature rise . 40
6.5 Requirements for earthing of equipment . 41
6.5.1 General . 41
6.5.2 Earthing of the enclosure . 41
6.5.3 Electrical continuity. 41
6.6 Requirements for the external insulation . 41
6.6.1 Pollution . 41
6.6.2 Altitude . 42
6.7 Mechanical requirements . 43
6.8 Multiple chopped impulses on primary terminals . 44
6.9 Internal arc fault protection requirements . 45
6.10 Degrees of protection by enclosures . 45
6.10.1 General . 45
6.10.2 Protection against access to hazardous parts and protection of the

equipment against ingress of solid foreign objects and water . 45
6.10.3 Protection of enclosure against mechanical impact under normal
operating conditions . 46
6.11 Electromagnetic compatibility (EMC) . 46
6.11.1 General . 46
6.11.2 Requirements for immunity . 46
6.11.3 Requirements for emission . 50
6.11.4 Requirements for transmitted overvoltage (TOV) . 50
6.11.5 Requirements for radio interference voltage (RIV) . 50
6.12 Corrosion . 50

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6.13 Markings . 50
6.13.1 General . 50
6.13.2 Terminal markings . 51
6.13.3 Rating plate markings . 51
6.14 Requirements for LPIT secondary terminal connection . 52
6.14.1 Requirements for digital output connection . 52
6.14.2 Requirements for analogue output connections . 53
6.15 EIT secondary signal noise . 54
6.16 Fire hazard . 55
6.17 Pressure withstand of gas-filled enclosures . 55
6.18 Failure detection of EIT . 55
6.19 Operability . 55
6.20 Reliability and dependability of electronic part of EIT . 55
6.21 Vibration requirements . 56
6.22 Storage climatic conditions withstand capability . 56
7 Tests . 56
7.1 General . 56
7.1.1 Classification of tests . 56
7.1.2 List of tests . 57
7.1.3 Sequence of tests . 58
7.1.4 Testing conditions . 60
7.2 Type tests . 60
7.2.1 General . 60
7.2.2 Temperature rise test . 61
7.2.3 Impulse voltage withstand test on primary terminals . 62
7.2.4 Wet test for outdoor type instrument transformers. 65
7.2.5 Electromagnetic compatibility (EMC) tests . 66
7.2.6 Tests for accuracy . 71
7.2.7 Verification of the degree of protection by enclosures . 74
7.2.8 Enclosure tightness test at ambient temperature . 74
7.2.9 Proof test for the gas-filled enclosure . 74
7.2.10 Mechanical tests . 75
7.2.11 Voltage withstand test of low-voltage components and secondary

terminals . 76
7.2.12 Storage climatic environmental tests . 77
7.2.13 Vibration test . 79
7.2.14 Durability of markings . 80
7.2.15 Tests for accuracy for harmonics . 80
7.2.16 Test for anti-aliasing . 81
7.3 Routine tests. 81
7.3.1 Power-frequency voltage withstand test on primary terminals . 81
7.3.2 Partial discharge measurement . 82
7.3.3 Power-frequency voltage withstand tests between sections . 84
7.3.4 Power-frequency voltage withstand tests on secondary terminals . 85
7.3.5 Power-frequency voltage withstand test for low-voltage components . 85
7.3.6 Test for accuracy . 85
7.3.7 Verification of markings . 86
7.3.8 Enclosure tightness test at ambient temperature . 86
7.3.9 Pressure test for the gas-filled enclosure . 86

IEC 61869-1:2023 © IEC 2023 – 5 –
7.3.10 Measurement of capacitance and dielectric dissipation factor . 87
7.4 Special tests . 87
7.4.1 Multiple chopped impulse test on primary terminals . 87
7.4.2 Transmitted overvoltage test . 88
7.4.3 Internal arc fault test . 92
7.4.4 Enclosure tightness test at low and high temperatures . 93
7.4.5 Insulation resistance measurement on secondary terminals . 94
7.4.6 Corrosion test . 94
7.4.7 Fire hazard test . 94
7.4.8 Thermo-mechanical endurance test . 95
7.4.9 Vibration and shock tests . 95
7.4.10 Tests for accuracy versus harmonics . 98
7.4.11 Seismic qualification . 98
7.5 Commissioning tests . 98
7.5.1 General . 98
7.5.2 Final installation inspection and tests . 98
7.5.3 Gas dew point test . 99
7.6 Sample tests . 99
8 Rules for transport, storage, erection, operation and maintenance . 99
8.1 General . 99
8.2 Conditions during transport, storage and installation . 99
8.3 Installation . 99
8.3.1 General . 99
8.3.2 Unpacking and lifting . 99
8.3.3 Assembly . 100
8.3.4 Mounting . 100
8.3.5 Connections . 100
8.3.6 Final installation inspection and tests . 100
8.4 Operation . 101
8.5 Maintenance . 101
8.5.1 General . 101
8.5.2 Responsibilities for the manufacturer . 101
8.5.3 Responsibilities for the user. 101
8.6 Failure report . 102
9 Safety . 102
10 Influence of products on the natural environment . 102
Annex A (normative) Identification of test specimen . 103
A.1 General . 103
A.2 Data . 103
A.3 Drawings. 103
Annex B (informative) Recommendation for contents of failure reports . 104
B.1 General . 104
B.2 Content . 104
Annex C (informative) Fire hazard . 106
C.1 Fire hazard . 106
C.2 Fire hazard test . 106
Annex D (informative) Sample test . 107
D.1 Sample test definition . 107

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D.2 Sample tests . 107
Annex E (informative) Technique used in temperature rise test of transformers to
determine the thermal time constant by an experimental estimation . 108
Annex F (informative) Guidance for the extension of validity of type tests or special
tests of instrument transformers . 111
F.1 General . 111
F.2 Information needed for extension of type test validity . 111
F.3 Application of extension criteria . 112
F.3.1 Dielectric tests . 112
F.3.2 Temperature rise tests . 112
F.3.3 Short-time and dynamic withstand current tests (current transformers) . 113
F.3.4 Internal arc fault tests . 114
F.3.5 Multiple chopped impulse test . 114
Annex G (informative) Guidance for the calculation of equivalent diameter in case of
irregular shape of insulating part . 116
G.1 General . 116
G.2 Current transformers and earthed voltage transformers . 116
G.3 Unearthed voltage transformers . 117
Annex H (informative) Test circuits . 119
H.1 Test circuits for accuracy measurements in steady state for current
transformers with analogue secondary signal . 119
H.2 Test circuits for accuracy measurements in steady state for voltage
transformers with analogue secondary signal . 123
Annex I (normative) Seismic qualification of instrument transformers . 127
I.1 Scope . 127
I.2 Seismic conditions . 127
I.2.1 Time-history . 127
I.2.2 Seismic severity of application . 127
I.2.3 Superelevation factor (k ) . 129
se
I.3 Seismic qualification information . 129
I.3.1 Qualification options . 129
I.3.2 General information provided by purchaser . 129
I.4 Qualification procedure . 129
I.4.1 General . 129
I.4.2 Qualification by static calculation or dynamic analysis . 130
I.4.3 Qualification by test . 137
I.5 Validity of qualification . 139
Bibliography . 140

Figure 1 – General block diagram of single-phase LPITs . 14
Figure 2 – Example of digital data acquisition system . 34
Figure 3 – Example of frequency response mask for EIT with digital output . 36
Figure 4 – Altitude correction factor for the temperature rise . 40
Figure 5 – Factor m for the switching impulse voltage (U ) withstand test . 43
SIL
Figure 6 – Example structure used in HV AIS applications subjected to EMC tests . 48
Figure 7 – Example of structure used in HV GIS applications subjected to EMC tests . 49
Figure 8 – Duplex LC connector . 53
Figure 9 – RIV measuring circuit .
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